Ionia Weather Forecast

    • 64
    • 74

    Chance Rain Showers

    • 62
    • 75

    Chance Rain Showers

    • 58
    • 74

    Rain Showers Likely

    • 49
    • 68

    Partly Sunny

    • 56
    • 65

    Rain Showers Likely

    • 55
    • 68

    Chance Rain Showers

    • 54
    • 68

    Chance Rain Showers

Today 15 Sep Ontario

Mostly sunny. Highs Ranging from the upper 60s on the Hilltops to the mid 70s across the lower Elevations. South Winds 10 to 15 Mph.

Tonight 15 Sep Ontario

Partly to mostly cloudy. A chance of Showers from late evening on. Warm with Lows in the lower 60s. South Winds 5 to 10 Mph, becoming southwest. Chance of rain 50 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Ionia Temperature Statistics

September Temperature

Rochester, Greater Rochester International Airport (15.5 miles)

  • Lowest 7 September, 2026

    50.6 °F

  • Average September

    69 °F

  • Highest 2 September, 2026

    85.6 °F

Climate (2021–2026)

Rochester, Greater Rochester International Airport (15.5 miles)

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  • Average Low 2021–2026

    42.2 °F

  • Average 2021–2026

    50.8 °F

  • Average High 2021–2026

    59.5 °F
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